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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Information regarding accumulated other comprehensive income (loss) for the six months ended June 30, 2021 and 2020 is as follows:

Accumulated Other Comprehensive Income (Loss)
PNMCorporate and OtherPNMR Consolidated
Unrealized
Gains on
Available-for-Sale Debt
Securities		Pension
Liability
Adjustment		Fair Value
Adjustment
for Cash
Flow Hedges
TotalTotal
(In thousands)
Balance at December 31, 2020$20,403 $(98,914)$(78,511)$(672)$(79,183)
Amounts reclassified from AOCI (pre-tax)
(5,632)4,174 (1,458)(903)(2,361)
Income tax impact of amounts reclassified
1,430 (1,060)370 229 599 
Other OCI changes (pre-tax)
329 — 329 1,804 2,133 
Income tax impact of other OCI changes
(83)— (83)(458)(541)
Net after-tax change
(3,956)3,114 (842)672 (170)
Balance at June 30, 2021$16,447 $(95,800)$(79,353)$— $(79,353)
Balance at December 31, 2019$10,638 $(109,693)$(99,055)$(322)$(99,377)
 Amounts reclassified from AOCI (pre-tax)
(3,059)4,150 1,091 (500)591 
Income tax impact of amounts reclassified
777 (1,054)(277)127 (150)
 Other OCI changes (pre-tax)
9,717 — 9,717 (1,198)8,519 
Income tax impact of other OCI changes
(2,468)— (2,468)304 (2,164)
Net after-tax change
4,967 3,096 8,063 (1,267)6,796 
Balance at June 30, 2020$15,605 $(106,597)$(90,992)$(1,589)$(92,581)